1 files changed, 54 insertions, 0 deletions
diff --git a/src/attack.cpp b/src/attack.cpp
new file mode 100644
index 0000000..226fe2f
--- /dev/null
+++ b/src/attack.cpp
@@ -0,0 +1,54 @@
+#include <attack.hpp>
+#include <components.hpp>
+#include <engine.hpp>
+#include <particle.hpp>
+
+constexpr int shortSlashLength = 100;
+constexpr int longSlashLength = 200;
+
+// math helpers because we don't trust stdlib
+template<typename T>
+inline T abs(const T& n) {
+	static_assert(std::is_arithmetic<T>::value, "abs expects numbers");
+	return n >= 0 ? n : -n;
+}
+
+
+void AttackSystem::receive(const AttackEvent& ae)
+{
+	attacks.emplace_front(ae);
+}
+
+void AttackSystem::update(entityx::EntityManager& en, entityx::EventManager& ev, entityx::TimeDelta dt)
+{
+	(void)en;
+	(void)ev;
+	(void)dt;
+
+	for (const auto& a : attacks) {
+		switch (a.type) {
+		case AttackType::ShortSlash:
+			en.each<Position, Solid, Health>(
+				[&a](entityx::Entity e, Position& pos, Solid& dim, Health& h) {
+					(void)e;
+					if (e.has_component<Player>())
+						return;
+					vec2 eloc (pos.x + dim.width / 2, pos.y + dim.height / 2);
+					if (abs(eloc.x - a.pos.x) <= shortSlashLength) {
+						h.health -= a.power;
+						game::engine.getSystem<ParticleSystem>()->addMultiple(10, ParticleType::SmallBlast,
+							[&](){ return eloc; }, 500, 7);
+					}
+				}
+			);
+			break;
+		case AttackType::LongSlash:
+			break;
+		default:
+			break;
+		}
+	}
+
+	attacks.clear();
+}
+